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tipc: introduce per-link spinlock

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As a preparation to allow parallel links to work more independently
from each other we introduce a per-link spinlock, to be stored in the
struct nodes's link entry area. Since the node lock still is a regular
spinlock there is no increase in parallellism at this stage.

Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy
2015-11-19 14:30:43 -05:00
committed by David S. Miller
parent 1d7e1c2595
commit 2312bf61ae
3 changed files with 25 additions and 26 deletions
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9
net/tipc/link.c
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@@ -1995,6 +1995,7 @@ int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
struct tipc_node *node;
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
struct net *net = sock_net(skb->sk);
struct tipc_link_entry *le;
if (!info->attrs[TIPC_NLA_LINK])
return -EINVAL;
@@ -2020,17 +2021,17 @@ int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
node = tipc_link_find_owner(net, link_name, &bearer_id);
if (!node)
return -EINVAL;
le = &node->links[bearer_id];
tipc_node_lock(node);
link = node->links[bearer_id].link;
spin_lock_bh(&le->lock);
link = le->link;
if (!link) {
tipc_node_unlock(node);
return -EINVAL;
}
link_reset_statistics(link);
spin_unlock_bh(&le->lock);
tipc_node_unlock(node);
return 0;